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This paper addresses the problem of designing a control that maximizes the harvested energy of a wave energy converter, in the presence of displacement constraints. The feasible displacement range is split into two segments. In the first segment (the inner segment), an unconstrained optimal control is used. In the outer segment, a constraint control is used. For the unconstraint control in the inner...
An inherent variable stiffness approach was proposed to suppress the rebound and impact of the electrostatic switch due to waveform deviations. A simple clamped-guided beam spring with large deflection, which generated inherent cubic nonlinear restoring force, was adopted for implementation of the approach. The initial stiffness is very small but increases significantly with the displacement. In this...
Wireless bilateral control based haptic teleoperation is a potential and challenging technique that extends human beings' sensing to a remote environment. However, communication delay in a bilateral control system directly influences the performance and even produces instability. This paper presents a stable and high performance bilateral control with a switching algorithm. This proposal uses the...
This study investigates the effect of different skewing methods and angles for switched reluctance machines (SRM) having high pole count using multiphysics simulations. A 24/16 SRM is modeled for each skewing method and different skewing angles using 3D electromagnetic finite element analysis (FEA). Mechanical and acoustical analyses are performed to evaluate the effectiveness of different skewing...
This paper investigates the influence of converter-fed operation on magnetic forces and radial vibration in a hydrogenerator. Flux density distribution is computed using time-stepping finite element (FE) analysis and used to calculate force density distribution based on Maxwell stress tensor. Both temporal and spatial characteristics of selected flux density and force density waves are studied. Important...
This paper focused on a fast mechanical switch applied in 2kV hybrid DC contactor. An integrated design of vacuum switch based on Permanent Magnetic Actuator (PMA) is proposed. The stainless steel bellows is removed to avoid vacuum failure caused by air leakage and eliminate restriction of bellows' fatigue life compared to conventional vacuum switch. Both monostable structure and compact springs'...
SF6 is a potent greenhouse gas and one of the promising alternatives is CO2. So this paper took CO2 rotating arc chamber as research object. The influence of the breaking angle and the magnetic field on the chamber was analyzed theoretically. Ansoft Maxwell software was used to simulate the magnetic field distribution in order to analyze the influence of the factors. Those factors are the number of...
A Tantalum Pentoxide (Ta2O5) based resistive nonvolatile memory device with bipolar switching behaviour was developed to demonstrate the new concept of memory in e-skin. The memory device showed stable switching behavior under preprogrammed voltage stimuli after an initial forming process. The memory cell was then integrated with a commercial tactile sensor with a new interface circuit, which enabled...
A robot with two independent driving wheels is used popularly as a service robot. Therefore, there is a lot of research on the autonomous locomotion. The robot with two independent driving wheels has a nonholonomic constraint in its model, so that it needs a specific control method when controlling it. In this research, we use an invariant manifold for solving such a nonholonomic constraint. The controller...
In contrast to precise position control of the robot arms and manipulators, the force control has been studied recently. The robust position control does not allow the robots to share the same space with humans because the robots faithfully follow the position command, and it may lead to break the contacted environments. The impedance and compliance control could set impedances of robots so that the...
The controlled switching technology of a short circuit current has been proposed for a long time. However, the opening time of the mechanism used in the high voltage circuit breaker is normally tens of milliseconds and has a variation of milliseconds. The electromagnetic repulsion mechanism has a very limited variation in the opening time. It provides a potential of achieving the controlled switching...
This paper presents three contributions in the filed of medical imaging applications using hand-held ultrasound probe: 1) a new type of belt-driven mechanism for force-controlled ultrasound probe (FCUS) and 2) a safe and precise position controller and 3) a new algorithm for endpoint avoidance in the limited motion range. To enhance the image quality, the probe-patient contact force is controlled...
In this paper, the dynamic characteristics of two types of electromagnetic repulsive force actuators are compared using the simulation of finite element method. The two electromagnetic repulsive force actuators are equipped with a single-sided coil and a double-sided coil respectively. Initially, the construction and theory of each of the electromagnetic repulsive force actuators are discussed. Subsequently,...
The Conventional conveyance systems have problems such as vibration, noise and raising dust. Most system consists of the levitation (and guidance) section and the thrust one. In this research, by using the linear stepper motor, these sections are combined. The experimental device to realize this system has been made. Because the coil is controlled by high switching frequency for levitation, the improved...
Dynamical colony pattern formation in motile cyanobacteria Pseudanabaena sp. was investigated. Collectives of the bodies are self-organized and form various motile colony patterns on agar plates. The coexistence of collective movements of four types was observed: translationally moving single strands, bundles, comet-like colonies, and a rotating disk. Additionally, the colony patterns switch to others...
In this paper preliminary results from investigations of the proof of concept of a nonlinear (vibrational) bistable inductive energy harvester are presented. The main idea proposed through this paper is to exploits the benefits of the snap-through buckling configuration in terms of capability to scavenge energy from wide band vibrations and the possibility to use the beam switching between its stable...
In this paper, it is proposed to use a matrix converter for linear induction motor (LIM) drives. A matrix converter is a direct AC-AC converter. It has the potential to regenerate power and to connect directly across the AC power line, thus it is possible to improve the efficiency in the entire system of LIMs drive. In this experiments, the operating characteristics of the matrix converter were examined...
This paper proposes a fault-tolerant control strategy for three phase linear switched-flux permanent magnet machine (LSFPMM) with modular structure, which has one-phase open-circuit fault. Under this condition, this three-phase LSFPMM has a novel perspective of the operating principle similar to two-phase machine. Based on finite element analysis (FEA), the performance of proposed fault-tolerant control...
A novel method of load resistance energy increase in the electric circuit with constant electromotive force is proposed in this paper. The method refers to electrical engineering. It was designed on the base of maximum power point calculation and may be used in the design of electric circuits with constant electromotive force to increase energy in load resistance.
A switched reluctance linear tubular motor that is proposed as a simple and cheap drive for a water pumps, which are in need in developing countries, is analyzed in the paper. In order to develop a strong driving force at the reciprocating motion a double coil motor with two springs is proposed. Driving electromagnetic static forces are analyzed for various motor dimensions using FEM. Simulation results...
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